标签：oxygen 相关文章
Module 2 My English lesson 第二模块 我的英语课 Unit 1 Open your book. 第一单元 打开你的书。 Activity 1 Listen and read. 活动1 听并读。 Good morning, class. 早上好，同学们。 Good morning, Miss Zhou. 早上好，周老师
新标准初中英语七年级上(2012版)
[00:00.00] Module 5 [00:08.39]Unit 1 [00:14.24]Exercise 1 [00:20.69]Listen and repeat. [00:25.23]tired [00:31.01]mountains [00:39.86]the Great Wall [00:50.02]sandwiches [00:55.88]sausages [01:04.63]a postcard
新标准小学英语第七册（三年级起点）
图片1 aerial n．天线 例句：The picture is much clearer with the new aerial. 装上新天线后画面清晰多了。 nitrogen n．氮 例句：Air consists chiefly of nitrogen. 空气主要由氮气组成。 oxygen n．氧 例句：Trees relea
漫画搞定六级词汇（文本+音频）
In Houston, Flight director Kranz is trying to make sense of the barrage of information. I am completely surrounded with reports coming in that I dont fully understand, but frankly, problems are our business, and I thought we are going to solve these
国家地理2007年
A: I am kind of confused about the in-flight instructions and need to ask you a few questions. B: It would be my pleasure to help you with any questions you might have. A: Where is that card that shows my nearest exit? B: That card is in the seat poc
旅游英语对话
A: Would it be all right if I asked you a few questions about your in-flight instructions? B: I would love to help clarify any questions you might have. A: When you were talking about the nearest exit, what were you talking about? B: Theres a card in
旅游英语对话
A: Can I ask you some questions about the in-flight instructions? B: I would be happy to help you clarify anything you need help with. A: Could you help me find out where my nearest exit is? B: There is a card in your seat pocket that shows you where
旅游英语对话
Just this, captain. In going toward the ocean's lower strata, we know that vegetable life disappears more quickly than animal life. 船长，人们所知道的情形是这样。人们知道，深入到海洋下的最底层，植物比动物更不容易
《海底两万里》中英双语有声读物
Part 4 Air Pollution 空气污染 Air is the ocean we breathe. Air supplies us with oxygen which is essential for our bodies to live. Air is 99.9% nitrogen, oxygen, water vapor and inert gases. Human activities ca n release substances into the air, some
CRI实用英语课堂
By David McAlary The U.S. Cassini spacecraft orbiting Saturn has found evidence that the giant planet's dazzling rings are decaying and may eventually be gone. And the rings are dirtier than thought,
VOA2004（下）--健康科技
Hyaluronic acid - the largest glycosaminoglycan known, it plays an important role of restricting the flow of water in tissues, particularly in synovial fluid where it acts as a lubricant.. Hydrogen bo
医务英语
VOICE ONE: This is SCIENCE IN THE NEWS in VOA Special English. I'm Bob Doughty. VOICE TWO: And I'm Faith Lapidus. This week, we will tell about two studies. Both involve the world's oceans. One study examined the health of coastal waters for fish an
VOA慢速英语2008年（九）月
EXPLORATIONS - Apollo 13: 'Houston, We've Had a Problem Here' BARBARA KLEIN: I'm Barbara Klein. STEVE EMBER: And I'm Steve Ember with EXPLORATIONS in VOA Special English. Today we continue the history of the American space program with the flight of
2012年VOA慢速英语(九)月
Study finds chest compressions are the real life-saver Art Chimes | St. Louis, Missouri 29 July 2010 Cardiopulmonary resuscitation, or CPR, has been around in its modern form for about 50 years. Its rhythms of chest compressions and mouth-to-mouth br
VOA标准英语2010年(七)月
新装置或能降低战斗机飞行员失去意识情况 Two different physiological situations can lead to a pilot's loss of consciousness,says Elbit Systems senior research and development director, retired fighter pilot YaronKranz. 埃尔比特系统
VOA标准英语2015年(十二月)
ROBERT SIEGEL, HOST: Adam Frank usually has his head in the sky. He's an astrophysicist. It's an occupational hazard. Right now, though, he is dazzled by the universe of green right here on Earth. ADAM FRANK, BYLINE: Now that we're well past the star
2017年NPR美国国家公共电台6月
JUDY WOODRUFF: Now the questions surrounding a research trial with newborn babies that allegedly didn't provide adequate disclosure to parents. The trial involved 1,300 infants at 23 hospitals who were born extremely prematurely between 2004 and 2009
PBS访谈健康系列
There is still no news about the 29 miners trapped in the Pike River coal mine. The company is still testing the air quality every half hour but it is still not safe to send in a rescue team. They are also drilling a hole 150mm diameter into the tunn
新西兰英语
巧妙拒绝别人 Establish boundaries and honor them for all to see 设定让所有人都知晓的界限，并坚决执行 Let your constituents know your priorities and limits. Don't continually break your own rules about when you are available or
英语听力广播—Listening
台湾籍旅美老师今天交给我们的句子是： Soft tissue, on the other hand, isn't as dense, and contains mostly lower atomic number elements, like carbon, hydrogen, and oxygen. So more of the X-rays penetrate tissues like lungs and muscles
留美老师带你每日说英文